Thanks to a traffic cop with a radar gun, R&B bad boy Bobby Brown has became the second member of his family to get busted for pot possession.

The singer joined wife Whitney Houston on the police blotter yesterday when cops in Atlanta allegedly caught him in the upscale Buckhead neighborhood driving his Cadillac Escalade 52 mph in a 35 mph zone – without license or insurance.

He had several pals – Whitney not included – in the SUV and less than an ounce of sweet leaf on his person, cops say.

He spent several hours in an Atlanta jail after the 2:30 a.m. bust, until officials discovered that Brown was wanted in nearby DeKalb County on a warrant for failing to appear in court to face a 1996 DUI charge.

At about 9 a.m., he was freed on $1,300 bail on the Atlanta marijuana charges and taken to the DeKalb County jail.

He was finally freed at about noon on another $10,000 bail.

Brown’s diva spouse was busted for pot possession at a Hawaii airport in 2000, but the charge was later dropped.